1.9 litre diesel engine specifications (Renault Megane 1)

Designation:

Engines without turbocharger
— 1.9D models

F8Q 620, F8Q 788*

Engines with turbocharger:

indirect injection - 1.9 dT models

F8Q 784, F8Q 786*

direct injection - 1.9 dT models

F9Q 730, F9Q 734*

Cylinder diameter

83.0 mm

Piston stroke

93.0 mm

Working volume

1870 cm³

Compression ratio:

f8Q engines without turbocharger

21.5:1

f8Q engines with turbocharger

20.5:1

f9Q Engines

18.3:1

Cylinder firing order

1-3-4-2 (cylinder #1 on flywheel/drive plate side)

Direction of rotation of the crankshaft

Clockwise when viewed from the pulley side

* Engines without intermediate shaft.

Normal pressure:

f8Q Engines
f9Q Engines

27 bar
22 bar

Minimum pressure - all engines

20 bar

Maximum difference between cylinders

4 bar

Inlet valve

0.20 mm

Exhaust valve

0.40 mm

F8Q engines with toothed belt drive "HTD" and F9Q engines

38±10% according to SEEM block

36 by SEEM block

F8Q engines with toothed belt drive "HTD2"

47±10% according to SEEM block

36 by SEEM block

Height:

f8Q Engines
f9Q Engines

159.50±0.20 mm
162.00±0.10 mm

Maximum permissible deformation of the gasket surface

0.05 mm

Vortex Chamber Protrusion Height - F8Q Engines

0.01 - 0.04 mm

Valve depth relative to cylinder head surface:

inlet

engines without turbocharger
engines with turbocharger

0.85±0.09 mm
0.65±0.09 mm

outlet

engines without turbocharger
engines with turbocharger

0.97±0.09 mm
0.97±0.09 mm

Valve seat angle:

inlet

f8Q Engines
f9Q Engines

120°
90°

outlet

f8Q Engines
f9Q Engines

90°
90°

Valve guide bushing inner diameter:

f8Q Engines
f9Q Engines - Rating

8.00 mm
7.0 mm + 0.02 mm

Valve guide bushing outer diameter:

f8Q engines:

nominal
repair

13.00 mm
13.30 mm

f9Q engines:

nominal
repair

12.00 mm + 0.03 mm - +0.05 mm
No data

Axial clearance

0.05 - 0.13 mm

Head diameter:

inlet

engines F8Q 620 and F8Q 788:

regular saddle
steel saddle*

36.100 mm
36.350 mm

engines F8Q 784 and F8Q 786

36.225±0.125 mm

f9Q Engines

35.200 mm

outlet

engines F8Q 620 and F8Q 788:

regular saddle
steel saddle*

31,500 mm
31,500 mm

engines F8Q 784 and F8Q 786

31.620±0.120 mm

f9Q Engines

32.500 mm

Rod diameter:

engines F8Q 620 and F8Q 788

8,000 mm

engines F8Q 784 and F8Q 786

7.985±0.040 mm

f9Q Engines

7.000 mm - 0.010 mm - 0.020 mm

Free length of valve spring:

engines F8Q 620 and F8Q 788

43.41 mm

engines F8Q 784 and F8Q 786

47.57 mm

f9Q Engines

45.80 mm

Cylinder valve diameter:

class A or 1

80.000 - 81.015 mm

class B or 2

80.015 - 80.030 mm

F9Q Engines - Rating

80,000 mm

* Cylinder size classes are indicated by holes on the side surface of the block, directly below the seating surface of the cylinder head.

Piston ring gaps (pre-installed)

Piston ring thickness:

upper compression ring:

engines without turbocharger

2.0 mm

engines with turbocharger

2.5 mm

second compression ring

2.0 mm

oil scraper ring

3.0 mm

Clearance between piston and cylinder wall

0.015 - 0.030 mm

Connecting rod bearing working clearance

0.014 - 0.053 mm

Lateral play of the connecting rod cap

0.220 - 0.400 mm

Intermediate shaft

axial clearance

0.07 - 0.15 mm

Main bearing journal diameter:

f8Q engines:

nominal
repair

54.795±0.01 mm
54.545±0.01 mm

f9Q engines:

nominal
repair

54.790±0.01 mm
No data

Main bearing working clearance

0.020 - 0.058 mm

Connecting rod bearing journal diameter:

f8Q engines:

nominal
repair

48.00 mm
47.75 mm + 0.02 mm - 0.00 mm

f9Q engines:

nominal
repair

48.00 mm + 0.02 mm
No data

Crankshaft axial clearance

0.070 - 0.230 mm

Thrust washer thicknesses

2.30, 2.35, 2.40 and 2.45 mm

Minimum oil pressure at 80°C:

at 1000 rpm
at 3500 rpm

1.2 bar
3.5 bar

Oil pump clearances:

minimum

between the gear and the housing
axial clearance of gear

0.100
0.020 mm

maximum

between the gear and the housing
axial clearance of gear

0.240 mm
0.085 mm

Valve Cover Nuts/Bolts

12

Camshaft Bearing Caps:

fasteners diameter 8mm

20

fasteners diameter 6mm

10

Camshaft timing gear bolt:

f8Q Engines
f9Q Engines

50
60

Timing Belt Tensioner Nut

50

Intermediate shaft gear bolt - F8Q 620, F8Q 784 and F9Q 730 engines

50

Roller Bolt - All Other Engines

No data

Fuel pump sprocket nut

Contact the Head Power supply and exhaust systems

Oil nozzle mounting bolts

20±2

Flywheel mounting bolts*

50 — 55

Pallet mounting bolts

12 -15

Drain plug
engine oil

Contact the Head Maintenance

Engine/gearbox mounts

Refer to Section 13

Reinforced Flywheel Bracket/Cover:

on the engine
on the transmission

50
25

Wheel mounting bolts

Contact the Head Maintenance

Cylinder Head Bolts - F8Q 620, F8Q 788 and all F9Q** engines:

stage 1 - all bolts in the order shown in Illustration 9.51

30

stage 2

Tighten all bolts 50° ±4°

stage 3

Wait 3 minutes

stage 4

Loosen bolts 1 and 2 completely

stage 5

Tighten bolts 1 and 2 to a torque of 25 Nm

stage 6

Tighten bolts 1 and 2 by 213° ±7°

stage 7

Loosen bolts 3 and 4 completely

stage 8

Tighten bolts 3 and 4 to a torque of 25 Nm

stage 9

Tighten bolts 3 and 4 by 213° ±7°

stage 10

Loosen bolts 5 and 6 completely

stage 11

Tighten bolts 5 and 6 to a torque of 25 Nm

stage 12

Tighten bolts 5 and 6 by 213° ±7°

stage 13

Loosen bolts 7 and 8 completely

stage 14

Tighten bolts 7 and 8 to a torque of 25 Nm

stage 15

Tighten bolts 7 and 8 by 213° ±7°

stage 16

Loosen bolts 9 and 10 completely

stage 17

Tighten bolts 9 and 10 to a torque of 25 Nm

stage 18

Tighten bolts 9 and 10 by 213° ±7°

Cylinder head mounting bolts - F8Q 784 and F8Q 786* engines:

stage 1 - all bolts in the order shown in Illustration 9.51

30

stage 2

Tighten all bolts 50° ±4°

stage 3

Wait 3 minutes

stage 4

Loosen bolts 1 and 2 completely

stage 5

Tighten bolts 1 and 2 to a torque of 25 Nm

stage 6

Tighten bolts 1 and 2 by 213° ±7°

stage 7

Loosen bolts 3 and 4 completely

stage 8

Tighten bolts 3 and 4 to a torque of 25 Nm

stage 9

Tighten bolts 3 and 4 by 213° ±7°

stage 10

Loosen bolts 5 and 6 completely

stage 11

Tighten bolts 5 and 6 to a torque of 25 Nm

stage 12

Tighten bolts 5 and 6 by 213° ±7°

stage 13

Loosen bolts 7 and 8 completely

stage 14

Tighten bolts 7 and 8 to a torque of 25 Nm

stage 15

Tighten bolts 7 and 8 by 213° ±7°

stage 16

Loosen bolts 9 and 10 completely

stage 17

Tighten bolts 9 and 10 to a torque of 25 Nm

stage 18

Tighten bolts 9 and 10 by 213° ±7°

stage 19

Start the engine and warm it up to normal operating temperature (the fan should turn on) - then turn off the engine

stage 20

Allow the engine to cool completely

stage 21

Tighten bolts 1 and 2 further by 120° ±7°

stage 22

Tighten bolts 3 and 4 further by 120° ±7°

stage 23

Tighten bolts 5 and 6 further by 120° ±7°

stage 23

Tighten bolts 5 and 6 further by 120° ±7°

stage 24

Tighten bolts 7 and 8 further by 120° ±7°

stage 25

Tighten bolts 9 and 10 further by 120° ±7°

Crankshaft pulley bolt:

early engines

90 — 100

Late engines with "HTD2" drive belt - with gripping compound on the thread:

stage 1
stage 2

20
Turn further by 115°

Connecting rod bearing cap bolts

45 — 50

Main bearing caps

60 — 65

Oil Pump Bolts - Engines F8Q 620, F8Q 784, F9Q 730:

bolts with a diameter of 6 mm
bolts with a diameter of 8 mm

10
22

Oil Pump - All Other Engines:

mounting bolts
sprocket bolts

No data
No data

* After the engine is started for the first time, there is no need to re-tighten the cylinder head bolts.
** Use new bolts.